Condensing apparatus.



P. CHRISTLEIN & G. MULLER CQNDENSING APPARATUS.

APPLICATION FILED NOV. I4. 1913.

Patented Dec. 28, 1915.

MVENTORS PAUL CHR\TLE\N GusTmJ MbLLER barren snares PATENT ornrcn PAULCHRISTLEIN, 0F NUREIVIBERG, AND GUSTAV MtjLLER, 0F CHARLOTTENBURG,

BERLIN, GERMANY.

CONDENSING APPARATUS.

Specification of Letters Fatent.

' Patented nee. 28,1915.

Applicationfiled November 14, 1913. Serial No. 801,021.

diflicult and cumbersomeowing to these machines requiring differentnumbers of revolutions. In centrifugal pumps for cooling water which arecalled upon to raise a very large volume to the smallhead of eight tosixteen meters, this number of revolutions is at about-300 to 1000 perminute; for con denser pumps particularly when they are used for thereturn feed of the boiler, at about 3000 to 7000 revolutions per minute;and finally, in pumps serving for the generation of pressure water forthe various jet apparatus for drawing off air the rotary speed is atabout 2000 to 4000 revolutions per minute. here such pumps are to bedriven by a high speed engine such as a steam turbine, efforts will bemade owing to the relatively small output and in considering cheapnessof manufacture and a fair eliiciency to impart to them a rotary speed ashigh as possible, that is, hardly less than 3000 revolutions per minute.In these circumstances,

therefore, a direct driving of all pumps-by, a

single driving engine is not possible.

- Hitherto the individual pumps were therefore provided with individualdriving motors or particular transmissions were constructed andinterposed between the individual pumps. ever, is rendered considerablysimpler, particularly for condensation plants, if according to thepresent invention one or several of the pumps themselves are constructedto form a liquid transmission so as to enable two or several shaftshaving dilferent'rotary speeds. to be used on which the different pumpsor also other auxiliary engines are distrlbuted at Wlll according totheir rotary speed. In this manner it is possible to drive The wholeworkin how the whole of the pumps or auxiliary engines at most variablespeeds simultaneously by means of a single driving engine.

The transmission is eifected by the more rapidly running (driving)centrifugal pump delivering its medium into a slower running turbinewhich latter is arranged directly to drive the different other pumpslocated either in the same casing or in an individual housing. Suchliquid transmissions are in general per 86 Well known in theconstruction of pumps. The great advantages of their use forcondensation plants, however, were hitherto not known.

Several constructional forms of a condensation plant according to thisinvention are shown by way of example in the accompanying drawings.

The construction shown in Figure 1 rep resents a cooling water pumparranged as a transmission pump. T he driving engine A .drives a smallhigh pressure centrifugal pump a which draws m a portion of the cool'ing water by way of the suction pipe 8' and raises it to a higherpressure than is necessary for the forcing of the cooling water; Theexcess energy is utilized for driving a blade wheel I) (turbine) whichis arranged concentrically to surround the pump a. The blade wheel 7) istherefore driven at a lower rotary speed than that of the high pressurepump a. After the water has delivered the excess energy to theblade'wheel b it passes into the pressure chamber 0 in which thepressure corresponds to the required head of the cooling water. Theblade wheel. I) is rigidly connected to a low pressure centrifugal' pump(Z which at a speed which is lower than that of the high pressure pump'drawsin the main volume of the cooling water by way of the suction pipe8 raising it directly to the required head and forcing it into thecondenser D by way of the pressure conduit 79. The slowly rotating shaftdriving shaft f is used simultaneously to p ncense drive a pump C forwater of condensation or a return feed pump. The higher the numdirectlydriven to be still further increased, the arrangement may be such thatthe liquid medium of the high, pressure pump is employed not only forspeed transmission but also for sucking away and for forcing the air ofthe condenser to the atmosphere. In this case further additional energymust be imparted to the medium and this is effected by raising thenumber of revolutions of the high pressure pump.

Fig. 2 illustrates an arrangement of the latter kind. The driving engineA again drives a high pressure centrifugal pump a which raises the waterto a head sufiicient for driving the slowly rotating blade wheel I) andfor operating an ejector L to remove air from the condenser D. Thereforefrom the blade wheel 6 the water is supplied through the-pressurechamber (2 and by way of the pressure conduit 29 to the jet device Lwhich removes air from the condenser. After passing through the ejectorL the water may either mix with the cooling water or be dischargedseparately from the latter. The low pressure pump (1 is coupled with the'blade wheel I), as in the first example, and raises the main volume ofthe cooling Water directly through the suction conduits s and forces itby way of the pressure pipe p; into the condenser D at-the requiredpressure. If it is desired to avoid the losses in the chamber 0 due tothe translation of velocity into pressure the velocity of the medium atthe outlet of the blade wheel 6 may be used directlyfor sucking away airand for-raising purposes by appropriately shaping the chamber a for thepassage of air. and connecting it with the air space of the condenser.In order .to protect the individual parts of the high pressure pump a,the blade wheel I) and the air removing apparatus from mechanically orchemically in pure water it will be advisable to cause die igh pressurepump a to withdraw from and discharge. into a tank filled With purewater so that the same liquid may be used continuously. T his has thefurther advantage of enabling other liquids than water to be used forpower transmitting and air removing purposes such as oil or mercurywhich owing to their low internal friction or great specific weightpromise a better degree of elficiency or a more compact construction.Moreover, such a tank may be placed at a sufficiently high level toinsure a starting of the pump in any circumstances and to be independentof the fluctuating suction level of the cooling water source? h Fig. 3representsnnarrangement of the latter kind. The high pressure pump asucks liquid by way of the pipe is 'i'roni the collecting tank E andforces it into the blade wheel I). As in the previous case, the liquidis forced through the pipe p into the air evacuating apparatus L whichdraws air from the condenser D through the pipe. 5

After passing the air suction apparatus the liquid returns to thecollecting tank E by way of the pipe it. In its passage it may beconducted through the condenser for cooling purposes or alternatively itmay itself 30 be cooled at some suitable place if this should benecessary. The blade wheel 1) drives, as in the previous examples, thecooling water pump d and the necessary pumps and auxiliary engines aredistributed 8!? at will on the shafts running at different speeds. Thecentrifugal wheels as well as the blade wheels may obviously beconstructed in various shapes according to the purpose of the plant andaccording as this is preferable in the construction of pumps orturbines. -Moveover, the pumps or turbines for the purpose of attaininga higher transmission ratio may be multi-staged or two or moretransmissions may be arranged as in series so that three or more shaftsrotating at different speeds would be used. Further, the whole aggregatemay be built into one casing in order to attain greater simplicity.

a 3 \Vhat we claim and desire to secure by Letters P atent:

1. A condensing plant comprising in combinatlon a mum condenser, a.single high speed driving engine, a high pressure centrifugal pumpdriven by said engine, a turbine driven by the fluiddischarged .fromsaid centrifugal pump and running at a lower speel than said pump, asecondary pumpmechanically connected with said turbine and an ejectorfor withdrawing air from the condenser, said ejector being actuated bythe fluid after it has passed through said turbine.

2. A condensing plant comprising in combination a main condenser, asingle high speed driving engine, a high pressure centrifugal pumpdriven by said engine, a turbine driven at a lower speed by the fluiddischarged from said centrifugal pump, a

secondary pump mechanically connected with said turbine, and an ejectorfor withdrawing air from the condenser, said ejector being operated byfluid from said pressure chamber after it has been discharged frompressure centrifugal pump driven by said engine, for raising aportion ofthe cooling fluid from said collecting tank, a turbine driven by thedischarge from said centrifugal pump and discharging directly into 5 apressure chamber, a secondary pump mechanically connected to saidturbine for sup'plying cooling fluid directly to the condenser, anejector for withdrawing air from the condenser, said ejector beingactuated L0 by fluid from the turbine, and a return pipe from saidejector to said collecting tank.

In testimony whereof we have afiixcd ou'r signatures 1n presence of twowitnesses.

DR. PAUL CHRISTLEIN. GUSTAV MOLLER.

Witnesses for Paul Christlein:

OSCAR BocK, RALPH Dox.

Witnesses for Gustav Mollerz WOLDEMAR 1-1 Aur'r, Timmy HASPER.

